'timescale ins/lns

module my_flow_led_tb();

//parameter define 
paramter T = 20;

//reg define 
reg sys_clk;
reg rst

wire [3:0] led;

//????????
initial begin
	sys_clk = 1'b0;
	sys_rst_n = 1'b0; // ??
	#(T+1) sys_rst_n = 1'b1; // ?? 21ns ???????????
end

//50Mh???????
always #(T/2) sys_clk = ~sys_clk;

//??myflow